第一種方法

function deepClone(arg){
  if(arg === null || typeof arg !== 'object'){
    return arg
  } 
  if(arg instanceof Array){
    var copy= []
    for(let i = 0;i<arg.length;i++){
      copy.push(arg[i])
    }
    return copy
  }
  if(arg instanceof Date){
    var copy = new Date()
    copy.setTime(arg.getTime())
    return copy
  }
  if(arg instanceof Object){
    let copy = {}
    for(let key in value){
      if(arg.hasOwnProperty(key)){
        copy[key] = deepClone(arg[key])
      }
    }
    return copy
  }
}

var arg = [1,2,{a:'xxx',b:['yyy',{s:1}]}]
var arr1 = deepClone(arg)

console.log(arr1==arg);
console.log(arg);

第二種方法:

function deepClone(arr){
  return $.extend([], arr); //[]這里是數(shù)組方法,如果是對象深拷貝就是{}
}
var arr1= [1,[22,222],3,'jjj']
var arr2 = deepClone(arr1)
arr1.push(arr1)
console.log(deepClone(arr2));
console.log(arr1);

第三種方法:

var a = { n: {name:'whatever'} }; 
var b = JSON.parse( JSON.stringify(a) );